Ignition-timer



E. B. menssofir.

IGNITION TIMER.

APPUCATION FKLED MAY 31, I919.

1,333,587. Patented Mar. 9, 1920.

INVENTOR,

WITNESSES XW .5 mwafificassmg entree!) n; monemttummy), ,u essecnusinfls, mssmnoemo 1r mfinumm' rms'rmnn, messeer'rusnrrs, A conr'onerron for I- i I l IGNITIQiT-IIMEB.

lli'lilletlon filed 19 19 Seth-i wwlwmii may w rr n 1 Be it? know: hat I; .Enjiimiio- B. Jeopaah'ig at Iitt'sfield, in the county of Berkshire ind-fState of Massachusetts, have invented hertaih new and -i1seful Improvements in I 'ition-Tim ers, of which the followingisqe sipeeificetion;

1 v t"lfhe present invention reletesto ignition tlm ngap'paratue adapted for use in connection with explosive engines, and particuiurlyponcerns structural improvementsin the contractor carried 'by- Improving the efficiency of the. nagnetie flux about the core in each of the induction-cod thenctive ignition circuit l'It'fOIO the eontac t-element.

unitsand thereby producinga spark at. the spark-gap of higher rolt-a'i'c :ind caloric v'alue. I,

The foregoing objects I achieve bythe revision of a eouta'ctor adapted to mtablih circuit eonneetion in ,:r new or succeeding: circuit before interrupting the existing circuit. i i p Tn devices oft-his character it has been the general practice to interrupt :md trrininiite allowing a new circuit to be closed. It may be observed that the instant of ignition in illGI'XlllUSlOll chamber of the engine is deferred pending a proper duration of circuit closure to enable the magnetic flux in the induction coil to build up and attain the requisite strength to produce a spark of sutlirient-caloric value to effectually ignite the explosive charge, and hence (1005 not usually occur until the eontiietor in the timingirppnrntne has travehidovtw n majorportion oi the sul'i'nee of As it. is desirnblethat be fully the our the present invention is developed; before the upplieation of rentto ign t on. designed in close this building up? prores should in the preceding circuit.

With the foregoing and other ob ects In View. the present invention consists in the the circuit in each induetron unit Immediately after ignition occnre to receive a hose:

. l I v Sp 'ieeeuon of Lette s re ine, I Patented Ma1-.:9. .1920.

806.014. i .v N p construction arrungemengeomhin flion ep e rii twie ii it aee bed en shonniund poin dcut in'therla msi Referr g 0 t ic-uccompenyrnggdriiiing}, i

. Flgu-re 11 is a, longitudinal 'yerheal sectionof an ignition timer-embodyingthe pree- .ent in'ventionm ts preierredii 'zuid diute the rotor portion andi'tlieiiice of the housing; Fig. .5, a. longitudinel vertical seetion of the lotorportion incom ng as shown in Fig. 1; Fig. 4, ev'ertie QI'O,$$;SGCtiOIlQf the: rotor awemblylonleplnne I oinejident with the inner-face;pfjfliel'quter1 1 earrie.r-nrm.; ,l ig. f5, 01. jront; file}; "itwl'o oi the contaetor carried bythe rotor-portion; Fig.

6. a side rien' oftheszune; Fig.7, rear vie of the same; and Fig. 8; a. detail side elevation of the rivet pin cerriedat the outer end of the coll ttlbtjl lllll for supporting'the rontaetor.

i th s] i ght modification, to motors dill'erent number of explosion cylherein illustrated lmng-adjustably mounted on the front of theeugiue housing '2 nnd rrungml to inclose the front end of a camelml't. 3, which il'if pmferubly geared to the main engine shaft- (not shown) and extends through 4| sultalllu openillgg in the wall of the engine lniusing.

'l'he Ira-r end of the (using 1 is open and sealed in a ircular recess 4 provided on the fare oi the engine housing 2, Silidj'tfil'hb being adapt d to prevent eccentric"dieplmmuncut-'0' zhe easing. Forward displsksurhent ofjthe ca$ing is v prevented preferably by :t epriiig-iclainp 5 removabli' gen-med at its rear end .to a stud or hol t'fi fixed ,to the wall ofthe engine housing 2,- aud engaging as its opposite end the outerextreinityof the reduced forward extension of." the front of depressioln the casing, which has a central 7 provided on the clamp n.

and may be otherwise mounted and of ap- Axial movement of the casing for regulatm the time of ignition is controlled by a cuate contacts 11,

the outside of the casing 1, for connection posed in the (plane of the insulation ring 10 and provide with an outer arcuate bearmg-face adapted to slidably the inner rim of t e insulation ring, the rear or inner face of the contao'tor being provided with the primary circuit of separate induction coils.

' Mounted to rotate with the shaft?! within the casing 1 is a metallic carrier 13 in a form of a sleeve which is normally sewasher 16 fitted i ends of the plates rim of the carrier.

-the reduced cured against axial movement on the shaft by a transversely arranged removable pin .14 projecting through a suitable opening '20 in t e'shaft andextending at one of its ends into a slot 15 he pin 14fis secured displacement by a cup over the outer end of the the exposed end of outer end 17 of the shaft being rejected through the cup washer 16 and s11 tabl'y threaded to rewive a pair of nuts 18, 19, which are employed in con- 'nnction with a flat washer 20, carried on endof the shaft and eh'gaging the face of he cup washer, to secure the latter in position.

The carrier 13 is laterally provided with a pair of fixed radial. arms .21, 21, arranged in spaoed'apara'llel relation to each ot er and pivot ly supporting at th6l1 outer ends a contact-arm comprising a pair 0 against end-wise carrier and inclosgif the pin, the redu oppositely arranged plates 22, 22, which are curved in outline and secured at their rear ends to the carrier arms by a transversely arran pin 23. Said pin 23 has l'BdllC/Bd extensions 24, 24, at opposite ends adapted to fit into corresponding openings provided in the plates 22, 22,- and are slightly bin-red at their extremities toprevent lateraldislacement of the plates. The contact-arm is reinforced centrally by a transverse spacer-pin 25, which is similar in form and manner of attachment to the pin 23, and is adapted to maintain the relative spacing of the plates 22, 22.

- Removably mounted between the front 22, 22, and extending through oppositely arranged transverse openings therein of corresponding size is a removable rivet 26 secured in position against lengthwise displacement at one end b a head 27 exteriorly engaging one of the p ates 22, and at the opposite end, which is slotted, b clenching the points 28, 28, so as to over ie the remaining plate 22.

Movably mounted on the rivet 26 between the plates 22, 22, is a contactor 29 having a longitudinally extended body-p0rtion disprrovided on the outer A torsion spring rin lish electrie'al'connec ionwith the succeedt e carrier 13 (see Fig.

with a reduced extension 30 adapted to seat formed by the plates transverse bore 81 to of the contaotor 29 is at its middle to rotransverse channe 82 being arranged to bear against the s seer-pin and the opsdsite end against 29 in cross-section has a. uniform dimension at. least equal to that of the insulation ring which extends therecontaetends which equi-v The contactor 10, to insure even wear at all .points upon the latter and the avoidance of any 'grooves or ridges which, otherwise resulting, would impair the p of the electric current. The length of the arc embracin both. contact faces of the contactoi' isd somewhat exceed the space between an two admcent contact-elements, on the 10 so that the contactor-may estabing contact-element the contactlament has last occurred. c

The object of thus'constructing the mntactor so that its overreach the opposing extremities of two adjacent contactlaments is twofold. Primar1ly-1t is intended to establish the cur ;before' entirely leaving n whose circuit ignition rent in the next firing circuit immediately after i nition has occurred in a given cu" esignedto tion extremities will barely c'uit without loss of time involved in the transition of the contactor from one cow tact-element to another, duri which the magnetic flux about the core 0 the induction-coil ma be built up to its maximum e-flicicncy. secondarily, the usual arcing of the current across the gap occurring between the contacto'r and the receding oon-. tact-element, and which has a tendency to injure their respective inctals, is avoided, as a new path for the current before the old is interrupted. I, a 1

The inclinations of t e faces 34,- 35, at the forward and rear ends of the contactor, respectively, are designed to maintain the original length of the are of contact, said inclinations being. at somewhat diflerent angles to compensate for slight changes in the relative positions of the contactor and the contact-arm caused by weerof the contactor. As shown, the outermaqiins'oi the plates 22, 22, are cutaway alt t eir outer is established ends to allow ample space for freepivotal ese parts keps m'condition; for remov'- mg from the su ace of the oontact-elements 11 11, etc, an a esions of non-conductive su ances. ndue wear of the engaging parts is suitable uid lubricant in accordance with V the usual practice, the lubricant bei preferably introduced in o the front 'cha r ber of the cas' througha closable inlet 36 provided in itswall. j

While the contactor 29 is designed to possess great durability and can be emloyed until the contact faces are worn well down toward the inner end of the chapnel 32, it may be renewed when necessary b the removal of the rivet 26 and the substitution of a new oontactor.

'Wlien the rotor assembly is removed for any reason from the cam-shaft 3, the outward swing of the contact am under the impulse of the spring 33 is limited by ''the provision of. positive stops iii the form of arcuate shoulders 37, 37, peripherally arranged on opposite sides of the carrier 13 and adapted to be engaged b inwardly extending feet 38, 38, provide 'on'the inner margin of the plates 22, 22.

claim: V

1. In an ignition timer, the combination with a, casing and contact-elements mounted in the casing, of a rotor portion mounted to move in the casing and comprising a carrier havinga radial extension, an arm pivotedjn angular relation on said extension, and bar ing a free end provided with a jaw, s ring means for impelling said free end 0 arm outward, asupport mounted in said jaw,

- and a contact-member pivotally mounted on the support in said jaw and disposed in the plane of the contact-elements in the casing, said contact-member having a longitudinal body-portion arranged in tangential relation to the axis'of the rotor portion, and angular extensions provided at opposite ends of the body portion and extending into position for en agement successively with the contact-elem nts of the casing.

2.'In an ignition timer, the combination with a casing and contact-elements mounted in the casing, of a rotor portion mounted to rotate in the casing and including an arm revented by the application of a pivoted in angular relation thereto and having a free on rovided with a jaw, spring meansjpr impe ing said free end of the arm outward, a contactor pivotally mounted in said jaw and having a pair of contacts arranged in alinement inthe direction of movement and extending'into position for engagement successively with the contactelements in the casing, the maximum reach of said contacts being greater than the interval'between any two adjacent contactelements.

3. In an ignition timer, a rotor portion including a carrier, an arm ivotall secured to the carrier and havin a an adapted to be moved toward an away from the car rier, spring means operating to move said free end of the carrier arm outward, a 0011- tactor pivotally mounted on said free end and having a body portion extended in the direction of its course of travel, and a pair of lateral extensions arran d at opposite ends of the body-portion ang extending outward and having arcuate contact faces, the foremost of said lateral extensions having a cutting edge provided on its front end, 4. In an ignition timer, the combination with a casin an annular insulation member arrange in the casing and having a travel-face, and regularly spaced contact elements embedded in exposed position on said travel-face,'of a rotor portion mounted to rotate in the casing andmeluding a carrier, an arm pivotally secured to the carrier and having a free end adapted to be moved toward and away from the carrier, spring means operating to move said free end of the carrier arm outward, a contactor pivotally mounted on said free end of 0 carrier arm and having a contact face of predetermined limits for engagement normally with the travel-face of said insulation member and having a body-portion extended in the plane of said insulation member and in angular relation to its own axis, the front and rear ends of the contaotor having planar faces arranged at predetermined mclinationsto the travel-face of said insulation member and adapted to maintain the original limits of the contact face on the contactor while the body of the contactor is reduced by wear.

In testimony whereof I hereunto allix my signature in the presence of two witnesses.

EDWARD B. JACOBSON. Witnesses:

Jim. I. Wnm'rnasnr, Josm O. HARNEY. 

